I think for any pilot that has not experienced this area of operation should not be so critical of this crew
Douala experiences 3,851mm of rain annually (151.6"). A point near Tiko airport (shown on the topo map immediately southeast of Mt. Cameroon) gets 10,300mm (405") per year!
On climbout from Tiko in a Twin Otter many, many years ago, I recall seeing a drop in T5 (Turbine Temp) of approximately 50 degrees Celsius, on both engines, caused by the firehose of water streaming in the intake!
Very intimidating indeed, but no excuse for loss of SA.